/Engine/Plugins/Experimental/ChaosVD/Source/ChaosVD/Public/ChaosVDPlaybackController.h
UnLocks the steps timeline of a given track so each time you move between frames, it will automatically scrub to the default step
void UnlockTrackStep ( [EChaosVDTrackType](API\Plugins\ChaosVD\EChaosVDTrackType) TrackType, int32 TrackID )